Do you twist your rings?

I've often wondered. Have you ever noticed when people who have rings on their fingers twist/rotate the rings? Is this a sign of nervous or have you heard if it has a deeper psychological meaning?

The man I've been dating, for the past 3 times I've seen him, will hold my hand - while holding my hand, he'll turn my ring on my pinky finger several times. He doesn't appear nervous, but it did make me wonder about it.

I have read that married people will turn their rings in the presence of others as a sign of attraction.

What's your thoughts?

I read a body language book that suggested ring turning could also be a sign of guilt.

Its more socialy accepable than scratching your balls.